modules/video_chroma/grey_yuv.c

   1 /*****************************************************************************
   2  * grey_yuv.c : grayscale to others conversion module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2007, 2008 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Sam Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_filter.h>
  35 #include <vlc_picture.h>
  36
  37 #define SRC_FOURCC  "GREY"
  38 #define DEST_FOURCC "I420,YUY2"
  39
  40 /*****************************************************************************
  41  * Local and extern prototypes.
  42  *****************************************************************************/
  43 static int  Activate ( vlc_object_t * );
  44
  45 static void GREY_I420( filter_t *, picture_t *, picture_t * );
  46 static void GREY_YUY2( filter_t *, picture_t *, picture_t * );
  47
  48 static picture_t *GREY_I420_Filter( filter_t *, picture_t * );
  49 static picture_t *GREY_YUY2_Filter( filter_t *, picture_t * );
  50
  51 /*****************************************************************************
  52  * Module descriptor.
  53  *****************************************************************************/
  54 vlc_module_begin ()
  55     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) )
  56     set_capability( "video converter", 80 )
  57     set_callbacks( Activate, NULL )
  58 vlc_module_end ()
  59
  60 /*****************************************************************************
  61  * Activate: allocate a chroma function
  62  *****************************************************************************
  63  * This function allocates and initializes a chroma function
  64  *****************************************************************************/
  65 static int Activate( vlc_object_t *p_this )
  66 {
  67     filter_t *p_filter = (filter_t *)p_this;
  68
  69     if( p_filter->fmt_out.video.i_width & 1
  70      || p_filter->fmt_out.video.i_height & 1 )
  71     {
  72         return -1;
  73     }
  74
  75     if( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width
  76        || p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height
  77        || p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
  78         return -1;
  79
  80     switch( p_filter->fmt_in.video.i_chroma )
  81     {
  82         case VLC_CODEC_GREY:
  83             switch( p_filter->fmt_out.video.i_chroma )
  84             {
  85                 case VLC_CODEC_I420:
  86                     p_filter->pf_video_filter = GREY_I420_Filter;
  87                     break;
  88                 case VLC_CODEC_YUYV:
  89                     p_filter->pf_video_filter = GREY_YUY2_Filter;
  90                     break;
  91                 default:
  92                     return -1;
  93             }
  94             break;
  95
  96         default:
  97             return -1;
  98     }
  99
 100     return 0;
 101 }
 102
 103 VIDEO_FILTER_WRAPPER( GREY_I420 )
 104 VIDEO_FILTER_WRAPPER( GREY_YUY2 )
 105
 106 /* Following functions are local */
 107
 108 /*****************************************************************************
 109  * GREY_I420: 8-bit grayscale to planar YUV 4:2:0
 110  *****************************************************************************/
 111 static void GREY_I420( filter_t *p_filter, picture_t *p_source,
 112                                            picture_t *p_dest )
 113 {
 114     uint8_t *p_line = p_source->p->p_pixels;
 115     uint8_t *p_y = p_dest->Y_PIXELS;
 116     uint8_t *p_u = p_dest->U_PIXELS;
 117     uint8_t *p_v = p_dest->V_PIXELS;
 118
 119     int i_x, i_y;
 120
 121     const int i_source_margin = p_source->p->i_pitch
 122                                  - p_source->p->i_visible_pitch;
 123     const int i_dest_margin = p_dest->p[0].i_pitch
 124                                - p_dest->p[0].i_visible_pitch;
 125     const int i_dest_margin_c = p_dest->p[1].i_pitch
 126                                  - p_dest->p[1].i_visible_pitch;
 127
 128     for( i_y = p_filter->fmt_in.video.i_height / 2; i_y-- ; )
 129     {
 130         memset(p_u, 0x80, p_dest->p[1].i_visible_pitch);
 131         p_u += i_dest_margin_c;
 132
 133         memset(p_v, 0x80, p_dest->p[1].i_visible_pitch);
 134         p_v += i_dest_margin_c;
 135     }
 136
 137     for( i_y = p_filter->fmt_in.video.i_height; i_y-- ; )
 138     {
 139         for( i_x = p_filter->fmt_in.video.i_width / 8; i_x-- ; )
 140         {
 141             *p_y++ = *p_line++; *p_y++ = *p_line++;
 142             *p_y++ = *p_line++; *p_y++ = *p_line++;
 143             *p_y++ = *p_line++; *p_y++ = *p_line++;
 144             *p_y++ = *p_line++; *p_y++ = *p_line++;
 145         }
 146
 147         for( i_x = p_filter->fmt_in.video.i_width % 8; i_x-- ; )
 148         {
 149             *p_y++ = *p_line++;
 150         }
 151
 152         p_line += i_source_margin;
 153         p_y += i_dest_margin;
 154     }
 155 }
 156
 157 /*****************************************************************************
 158  * GREY_YUY2: 8-bit grayscale to packed YUY2
 159  *****************************************************************************/
 160 static void GREY_YUY2( filter_t *p_filter, picture_t *p_source,
 161                                            picture_t *p_dest )
 162 {
 163     uint8_t *p_in = p_source->p->p_pixels;
 164     uint8_t *p_out = p_dest->p->p_pixels;
 165
 166     int i_x, i_y;
 167
 168     const int i_source_margin = p_source->p->i_pitch
 169                                  - p_source->p->i_visible_pitch;
 170     const int i_dest_margin = p_dest->p->i_pitch
 171                                - p_dest->p->i_visible_pitch;
 172
 173     for( i_y = p_filter->fmt_out.video.i_height; i_y-- ; )
 174     {
 175         for( i_x = p_filter->fmt_out.video.i_width / 8; i_x-- ; )
 176         {
 177             *p_out++ = *p_in++; *p_out++ = 0x80;
 178             *p_out++ = *p_in++; *p_out++ = 0x80;
 179             *p_out++ = *p_in++; *p_out++ = 0x80;
 180             *p_out++ = *p_in++; *p_out++ = 0x80;
 181             *p_out++ = *p_in++; *p_out++ = 0x80;
 182             *p_out++ = *p_in++; *p_out++ = 0x80;
 183             *p_out++ = *p_in++; *p_out++ = 0x80;
 184             *p_out++ = *p_in++; *p_out++ = 0x80;
 185         }
 186
 187         for( i_x = (p_filter->fmt_out.video.i_width % 8) / 2; i_x-- ; )
 188         {
 189             *p_out++ = *p_in++; *p_out++ = 0x80;
 190             *p_out++ = *p_in++; *p_out++ = 0x80;
 191         }
 192
 193         p_in += i_source_margin;
 194         p_out += i_dest_margin;
 195     }
 196 }
 197